Kitchen sponges are the No. 1 source of germs in the whole house. Why? The moist, micro-crevices that make a sponge such an effective cleaning device also make it a cozy home for germs and more difficult to disinfect. Wiping your counters or dishes with a dirty sponge will only transfer the bacteria from one item to another. "Wet your sponge and then pop it in the microwave for two minutes to eliminate the germs that lurk inside the crevices," says Neil Schachter, MD,


- source
http://www.webmd.com/food-recipes/features/germs-in-kitchen